Knife for ink mills



J. RUCKRIEGEL KNIFE FOR INK MILLS Sept. 23 1924. 1,509,612

Filed Dec. 10 1921 Patented Sept. 23, 1924.

UNITED STATES PATENTOFFl-CE.

JOHN RUCKRIEGEL, OF CINCINNATI, OHIO, ASSIGNOR TO THE J. H. DAY COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

KNIFE FOR INK MILLS.

Application filed December 10, 1921.

To aZZ whom it may concern:

Be it known that I, JOHN RUoKRInonL, a citizen of the United States of America, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and useful Improvement in Knives for Ink Mills, of which the following is a specification.

My invention relates to a scraper knife for ink mills. It is considered the most important part and upon the design and care with which the knife is made depends the perfect cleaning of the delivery roll.

Ink mills generally consist of three horizontal hardened rolls with ground and polished surfaces which are pressed together and are rotated at different speeds so that the pigment fed to the first roll is rubbed and spread out over the surface of the next roll, and from the second roll passes to the next roll, until the ink is finally scraped off by the knife.

The usual knife is made out of tool steel (not hardened) and is attached with many screws to the so-called apron, which tilts or turns on trunions and is by spring pressure turned and pushed against the last roll of the series.

The usual procedure of attaching the knife blades to the apron consists in milling a depression in that portion of the apron nearest to the roll the depth of the depression being equal to the thickness of the blade which blade is attached to the apron with many screws, the heads of which must all be flush with the apron surface. This is very important as the. apron must be cleaned thoroughly after every batch of ink has passed thru the mill. Any depression in the apron surface cannot be reached by the blade of the scraper used to clean the apron, with the result that ink will harden in the depression and the next batch of ink coming thru the machine will loosen these particles of hard ink and will cause blemishes in the ink.

The life of a knife depends on the material handled by the mill and varies between three and six months. After this the knife has to be removed and replaced by a new one. This replacement is quite cumbersome and takes from four to six hours. This is a very costly loss of time. My improvement in knife blade construction successfully overcomes this loss of time, and also pro- Serial No. 521,493.

vides each knife blade with two edges for scraping purposes. An object of my invention is to provide a knife that may be mounted upon a mill of the type referred to, without danger of providing any recesses in which ink may lodge and harden.

Another object to conserve material used in making such knives.

Another object is to provide a flexible knife for this purpose.

Another object to simplify the mounting of such knife.

Another object is to provide a structure which will permit change of knives within a minimum period of time.

These and other objects are attained by the means described herein and disclosed'iii the accompanying drawings in which:

F l is a side elevation of an ink mill having mounted on it a knife embodying my invention. a Y

Ifig. 2 is a perspective view of a knife and knlfe mounting, all of which form details of my invention.

Fig. 3 is a sectional view Fig. 2.

The mill A comprises rolls a, a, and a which rub the ink between one another as the ink passes from a toa all of which is common and Well known in the art. My in vention' is concerned with the knife Z) wherewith the ink is remo-vedfrom the roll a All of these rolls are of chilled iron, are highly polished, and are so related that particles of ink only, each particle being about gof an inch in thickness, pass singly between the rolls.

The ink removing device B comprises the knife 6 mounted on the table or apron Z). The apron is pivotally mounted on the trunnio-ns b extendingfrom the frame a of the mill, by means of lugs 6 extending from the lower portion of one end of the table. The other end of the table has pivo'tally mounted on it a threaded shaft b which extends reciprocally thru a block a? formed on the mill. A hand-wheel Z) is ad justably mounted on the threaded portion of the shaft, and the ends of a spring Z) abut the handwheel and the block a This structure permits very fine adjustment of the table or apron about its pivotal mounting on the mill and also provides means to yieldingly move the apron toward the roll (1 on line 3 -3 of curately finished so that when any one blade of a knife is inserted in the slot b the body of the knife will so nicely engage the end I)? above the slot, that the upper face of the 1), into which a block other blade will extend in alignment with the face I) of the apron, and the joint between the body of the knife and the apron will afford no lodgement for any ink. Because of the nicety of the fit between the parts, removal and mounting of knives are facilitated by providing the sides I) of the table with slots may be inserted to tap the knife free of the apron.

The table, at its: opposite sides is provided with tapered notches I) which register with the opposite ends of the body b of the knife, and the block inserted through the slot I) may enter the notches I) and engage the body 6 in order to tap the knife loose. .The slots in the sides I)" also permit cleaning of the knife seat or slot 6 From the foregoing it is apparent that each blade serves both to remove ink from the roll and to mount the knife on the apron, thereby doubling the life of a knife and conserving' by half the material necessary to provide a given number of knives. The body of the knife gives ample support to the knife wherefore the blades may be made thinner than has been customary heretofore thereby producing flexibility of the blade to the extent necessary to cause all parts of the blade immediately adjacent the roll to tightly hug such roll along the entire blade edge to remove the ink from such roll. As a successful ink mill knife must completely remove the ink from the roll, such atight fitting blade gives a far superior performopposed surfaces ance than has been attained heretofore.

' The beveled edges at the outer ends of the blades makesit possible to use botlr blades to remove ink from the roll as described.

Vhat I claim is:

1. A scraper knife of. the class described comprising a bot y, and blades extending from the body, one each of the diametrically of the body extending in alignment with one face of ablade, and each blade having a transversely extending scraping edge at its free end.

2. A scraper knife of the class described comprising a body, and blades extending from opposite sides of the body, and each blade having a surface in alignment with one of the opposite sides of the body, and each blade having a transversely extending scraping edge at its free end.

3. A mill scraping knife and mounting of the class described comprising a table having a transverse slot in one of its ends, and a knife engaging in said slot and having one of its surfaces in alignment with the table ltop.

4. A mill knife mounting of the class described comprising a slotted table, a knife, and a shank on the knife for engagement in the slot for securing the knife upon the table with one face in alignment with the table top.

5. A mill scraper knife and mounting therefor of the class described comprising a.

table having a top face, a. plane end and a slot extending from said end, the slot being spaced below and having its opposite walls extending in substantial parallelism with one another and with the top face of the table and in the perpendicular to said end of the table, and a knife having a body having opposed parallel lane faces for engagement upon the plane e ge of the table and having blades extending in opposite directions from the body and of a thickness substantially equal to the space between the parallel walls of the slot in the table, the blades extending from the body at opposite ends thereof, each having a face extending in alignment with a portion of the body of the knife and for alignment with the top fate of the table when the other blade is lodged in the slot.

(3. A mill knife and mounting of the class described comprisin a slotted table, a knife, and a shank on the knife for engagement in the slot for securing the knife upon the table with one face in alignment with the table top, the knife and table being constructed alt their sides to permit removal of the knife from the slot by driving the shank.

7. A mill scraper knife and mounting comprising a table having a face for receiving ink and the like, having a slot in its end, and having notches communicating with the slot alt. the side of the mouth of the slot and disposed between the slot and said table face, and a scraping knife having a body. a scraping edge, a face extending from the scraping edge over the body, and a shank for lodgement in the slot for mounting the knife on the table with. said knife face in alignment with said table face, the body being exposed through the notches for driving, the shank from the slot.

8. A mill scraper knife and mounting comprising a table having a face for receiving ink and the like, having a slot and a notch in its end, and a scraping knife having a scraping edge, a face extending from the scraping edge for receiving ink, and a shank for lodgement in the slot for mounting the knife on the table with said knife face in alignment with said table face whereby ink received by the knife face may move to said table face, the knife being exposed at the notches in the table for driving the shank from the slot.

9. A mill knife mounting of the class de scribed comprising a slotted table, a knife, and a shank on the knife for engagement in the slot for securing the knife upon the table with one face in alignment with the table top.

10. A scraper knife comprising a pair of oppositely extending blades united by a common body portion, the blades disposed in offset relation one to the other, the faces of the blades extending in substantial parallelism and the innermost end of each blade forming an abutment shoulder adjacent the innermost parallel face of the other blade.

11. A scraper knife and mounting comprising a plane faced table having a slot at its end, the walls of the slot extending in parallelism with the plane face of the table, a knife comprising a pair of oppositely extending blades united by a common body portion, the blades being disposed in offset rela'tion, whereby the end of one blade adjacent the body portion forms an abutment shoulder with a face of the other blade, the faces of the blades extending in parallel planes, the blades interchangeably serving as a shank for insertion in the slot in, (the table with the abutment shoulder of the other blade in engagement with the end of the table, and a face of the last mentioned blade in alignment with the plane face of the table.

In testimony whereof, I have hereunto subscribed my name this 5th day of December, 1921.

JOHN RUCKRIEGEL.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,509, 12, granted September 23, 4, upon the application of John Ruckriegel, of Cinci improvement in Knives for Ink Mills? errors appear in the printed specification requiring correction as follows: Page 2, line 111, claim 6, for the Word knife read slum/0 and for the Word shank atent should be read with these corrections therein that to the record of the case in the ce.

Signed and sealed this 11th day of November, A. D. 1924.

[SEAL] KARL F EN N IN G,

Acting Commissioner of Pa -tents.

tie same may conform 

